Java Program to Calculate Areas of Different Shapes using Method Overloading

import java.util.Scanner;

public class AreaOfShapes {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int choice;
        do{
            System.out.println("1. Square\n2. Circle\n3. Rectangle");
            choice = sc.nextInt();

            switch (choice){
                case 1:
                    System.out.print("Enter Side : ");
                    int side = sc.nextInt();
                    System.out.println("Area : "+area(side)+" units");
                    break;
                case 2:
                    System.out.print("Enter Radius : ");
                    Float radius = sc.nextFloat();
                    System.out.println("Area : "+area(radius)+" units");
                    break;

                case 3:
                    System.out.print("Enter Breadth : ");
                    int breath = sc.nextInt();
                    System.out.println("Area : "+area(1,breath)+" units");
                    break;
                default:
                    System.out.println("Enter valid option!");
            }
        }while (choice<4);

    }

    public static float area(float radius){
        return (float)Math.PI * (radius * radius);
    }
    public static int area(int side){
        return side*side;
    }
    public static int area(int length, int breath){
        return length * breath;
    }

} 

Output:

1. Square

2. Circle

3. Rectangle

1

Enter Side : 12

Area : 144 units

1. Square

2. Circle

3. Rectangle

1

Enter Side : 2

Area : 4 units

1. Square

2. Circle

3. Rectangle